Index import dependencies for local scope scheduling

docs/roadmap/remediation.md

@@ -152,7 +152,7 @@ and race-enabled import/destination tests passed with Go 1.26.10 on Linux.
 
 ## 3. Restrict Import-Scope Edge Preparation To Relevant Nodes
 
-Status: open. Priority: medium. Category: algorithmic efficiency and allocation
+Status: complete (2026-10-25). Priority: medium. Category: algorithmic efficiency and allocation
 scaling.
 
 **Evidence.** `scheduleAcquisitionScopes` in
@@ -190,3 +190,16 @@ coverage in [imports_test.go](../../internal/engine/imports_test.go) and
 existing destination/provenance evidence tests. Cover broad independent item
 scopes if a consequential gap remains; verify index construction and edge
 visitation bounds by source review without new performance gates.
+
+**Completion.** Scheduling now builds an importer-to-target adjacency index once
+for an acquisition and shares it across outer and pending item scopes. Grouped
+scheduling builds its own index once. Local preparation visits only adjacency
+lists for participating identities, includes only edges with both endpoints in
+the local slot map, and allocates edge storage as needed rather than reserving
+the whole graph per scope. For the broad sibling family, preparation is O(E + P)
+before the unchanged stable Kahn scheduling. The inclusion graph and cycle
+diagnostics remain unchanged. Tests cover excluded endpoints/unselected slots
+and broad main/underlay item scopes with retained helper origins and projected
+destinations. Focused scheduling tests, the development check, documentation
+links, and `go test -race ./...` passed with Go 1.26.10 on Linux. No timing or
+allocation thresholds were introduced.